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2. Luhn algorithm - Wikipedia

   en.wikipedia.org/wiki/Luhn_algorithm

   The check digit is computed as follows: Drop the check digit from the number (if it's already present). This leaves the payload. Start with the payload digits. Moving from right to left, double every second digit, starting from the last digit. If doubling a digit results in a value > 9, subtract 9 from it (or sum its digits).

3. Want to Decode Your Credit Card Number? Check Out This ... - AOL

   www.aol.com/news/2011-02-11-want-to-decode-your...

   In this infographic, our friends at Mint.com decode your credit card number and show you one way to determine if a card is

4. Check digit - Wikipedia

   en.wikipedia.org/wiki/Check_digit

   The final digit of a Universal Product Code, International Article Number, Global Location Number or Global Trade Item Number is a check digit computed as follows: [3] [4]. Add the digits in the odd-numbered positions from the left (first, third, fifth, etc.—not including the check digit) together and multiply by three.

5. Payment card number - Wikipedia

   en.wikipedia.org/wiki/Payment_card_number

   A payment card number, primary account number (PAN), or simply a card number, is the card identifier found on payment cards, such as credit cards and debit cards, as well as stored-value cards, gift cards and other similar cards. In some situations the card number is referred to as a bank card number. The card number is primarily a card ...

6. What do the numbers on your credit card mean? - AOL

   www.aol.com/finance/numbers-credit-card-mean...

   Key takeaways. The numbers on a credit card help identify the credit card network, the company that issued the card and the cardholder. Credit card numbers are either 15 or 16 digits, with each ...

7. What does it mean when your credit card application is ... - AOL

   www.aol.com/finance/does-mean-credit-card...

   How to check your credit card application status. Each issuer has different application processes and ways of allowing you to check your credit card application status. If you’re waiting on an ...